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Submission #772263

# Submission time Handle Problem Language Result Execution time Memory
772263 2023-07-03T20:42:24 Z danikoynov Potatoes and fertilizers (LMIO19_bulves) C++14
30 / 100
 104 ms 18520 KB 
#include <iostream>
#include <set> 
#include <cassert>
#include <numeric>
#define endl '\n'
 
typedef long long ll;
using namespace std;
const int BUFF_SIZE = 1e6;
int buffPos = BUFF_SIZE - 1;
char buff[BUFF_SIZE];
 
void readChar()
{
    if (++buffPos == BUFF_SIZE) fread(buff, BUFF_SIZE, 1, stdin), buffPos = 0;
}
 
void readInt(int &num)
{
    num = 0;
    for (; '0' > buff[buffPos] || buff[buffPos] > '9' ; readChar());
    for (; '0' <= buff[buffPos] && buff[buffPos] <= '9' ; readChar())
        num = 10 * num + buff[buffPos] - '0';
}
 
struct slope_trick
{
    const ll inf = 1e18;
 
    std::multiset < ll > left_set, right_set;
    ll height;
 
    slope_trick()
    {
        height = 0;
    }
 
    void add_basic(int v) /// adds |x - v|
    {
        ll left = -inf;
        ll right = inf;
        if (!left_set.empty())
            left = *left_set.rbegin();
        if (!right_set.empty())
            right = *right_set.begin();
 
 
        if (v >= left && v <= right) /// function on base
        {
            left_set.insert(v);
            right_set.insert(v);
        }
        else
        if (v < left)
        {
                left_set.erase(left_set.find(left));
            right_set.insert(left);
 
            left_set.insert(v);
            left_set.insert(v);
            
            height = height + abs(left - v);
        }
        else
        if (v > right)
        {
            ///std::cout << v << " " << right << endl; 
   
                right_set.erase(right_set.begin());
            left_set.insert(right);
 
            right_set.insert(v);
            right_set.insert(v);
 
            height = height + abs(right - v);
        }
    }
 
 
    void print_slope_trick()
    {
        std::cout << "left_slope" << endl;
        for (int cor : left_set)
            std::cout << cor << " ";
            std::cout << endl;
            std::cout << "right_slope" << endl;
        for (int cor : right_set)
            std::cout << cor << " ";
        std::cout << endl;
        std::cout << "height " << height << endl;
    }
 
    ll get_right()
    {
        if (right_set.empty())
            return inf;
        return *right_set.begin();
    }
 
    ll get_left()
    {
        if (left_set.empty())
            return -inf;
        return *left_set.rbegin();
    }
 
    void prefix_minimum()
    {
        while(left_set.size() > 0)
        {       
            ll val = *left_set.begin();
            if (val >= 0)
                break;
                assert(left_set.size() > 0);
            left_set.erase(left_set.find(val));
        }
 
        ll slope = 0, base = height, last = get_right();
        
        while (get_right() <= 0)
        {
            ll distance = get_right() - last;
            base = base + distance * slope;
            slope ++;
            last = last + distance;
            assert(right_set.size() > 0);
            right_set.erase(right_set.begin());
        }
        
        if (slope != 0)
        {
            base = base + (- last) * slope;
            right_set.insert(0);
        }
        height = base;
 
        right_set.clear();
        ///right_set.clear();
    }
 
    ll query_vlaue(ll debit)
    {   
        ll last = get_left(), slope = 0, base = height;
        while(left_set.size() > 0 && last > debit)
        {
            ll distance = last - get_left();
            base = base + distance * slope;
            slope ++;
            last = last - distance;
            assert(left_set.size() > 0);
            left_set.erase(left_set.find(*left_set.rbegin()));
        }
 
        if (slope != 0)
        {
            base = base + (last - debit) * slope;
        }
 
        return base;
    }
};
 
 
const int maxn = 500010;
 
int n;
int a[maxn], b[maxn];
ll x[maxn], pref[maxn];
 
void solve()
{
    readInt(n);
    for (int i = 1; i <= n; i ++)
    {
        readInt(a[i]);
        readInt(b[i]);
        x[i] = a[i] - b[i];
        pref[i] = pref[i - 1] + x[i];
    }
 
    slope_trick st;
    for (int i = 1; i <= n; i ++)
    {
        st.add_basic(pref[i]);
        st.prefix_minimum();
        //std::cout << "--------------------" << endl;
        //st.print_slope_trick();
    }
    ///std::cout << "dasdas" << endl;
    ll ans = st.query_vlaue(pref[n]);
    ///std::cout << "-----------------" << endl;
    std::cout << ans << endl;
}
 
void speed()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    std::cout.tie(NULL);
}
 
int main()
{
    speed();
    solve();
    return 0;
}

Compilation message

bulves.cpp: In member function 'void slope_trick::print_slope_trick()':
bulves.cpp:83:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   83 |         for (int cor : left_set)
      |         ^~~
bulves.cpp:85:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   85 |             std::cout << endl;
      |             ^~~
bulves.cpp: In function 'void readChar()':
bulves.cpp:15:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     if (++buffPos == BUFF_SIZE) fread(buff, BUFF_SIZE, 1, stdin), buffPos = 0;
      |                                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 12 ms 2824 KB Output is correct
5 Correct 28 ms 5464 KB Output is correct
6 Correct 100 ms 18520 KB Output is correct
7 Correct 79 ms 14384 KB Output is correct
8 Incorrect 104 ms 13140 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 12 ms 2824 KB Output is correct
5 Correct 28 ms 5464 KB Output is correct
6 Correct 100 ms 18520 KB Output is correct
7 Correct 79 ms 14384 KB Output is correct
8 Incorrect 104 ms 13140 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 472 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 472 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 5 ms 468 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 596 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct

Subtask #5
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 472 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 12 ms 2824 KB Output is correct
12 Correct 28 ms 5464 KB Output is correct
13 Correct 100 ms 18520 KB Output is correct
14 Correct 79 ms 14384 KB Output is correct
15 Incorrect 104 ms 13140 KB Output isn't correct
16 Halted 0 ms 0 KB -